Pneumatic tool.



PATENTBD SEPT. 22, '1903.

B.' e; KQTTBN.' PNBUMATIG Toor..

APPLOATION FILED JUNI 8, 1903.

I0 HODEL.

@mi Cueoauag @QJ s UNITED STATES Patented september 22, 1903.

HERMAN e. ROTTEN, or NEW YORK, N. Y.

PNEuMATioTooL.

SPECIFICATION forming part of Letters Patent N o. 739,609, datedSeptember 22, 1903.

Application filed J' une S, 1903. Serial No. 160,533. (Nomudel.)

To all whom it may concern.-

Be it known that I, HERMAN G. KOT'IEN, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented a new and useful Improvement in Pneumatic Tools, of whichthe following is a specification.

My invention relates to pneumatic tools 3" and it consists of a novelconstruction of a push-handle for the same, whereby the reciprocationsofthe hammering-piston are automatically stopped without requiring anyattention from the operator as soon as the pressure of thetool upon thework is relieved. It has heretofore been proposed to supply pneumatictools of various ltypeswith graspinghandles and to provide these handleswith various types of manually-operated levers or throttle-valvedevices, and it has also been heretofore attempted to constructpush-lian-- dles adapted to coact with throttle-valves operated bycoil-springs and the like. In my present invention, however, I dispenseentirely with the use of springs and provide a device which isautomatic'under all conditions and requires no attention whatever fromthe operator, the number of parts andthe expense of manufacture arereduced to a minimum, andthe liability of damage to any of the parts isentirely obviated.

To the above ends my invention consists,

broadly, of the novel combination of a pneu-`V matic tool, a cylindercap or head therefor, a differential throttle-valve mounted in' saidcap, and a handle adapted to coact with said throttle-valve, thearrangement of the parts being such that upon the removalof the toolfrom the work or the releaseofthe pressure upon the handle thelive-air"pressureiuponv the differential areal of the throttle-valveautomatically closes the same and effects the Y represents, on a reducedscale, a detail view engaged bythe cylinder head or cap 3,7which` isadapted to be in threaded or other engagement therewith and is'Y held inthe desired position by means of the' threaded bolt or other fasteningdevice 4. In the body portion 5 of the cylinder-cap 3 is located theinlet-port or pressure-supply duct 6, into which compressed air is ledthrough thecoupling air-'strainer 7, which is of the usual constructionand is adapted to have the extremity of the compressed-'air inlet pipeor hose (not shown) connected thereto in Ithe usual manner. vIt will beunderstood that the coupling- 'strainer 7 is constructed in theconventional manner and! isfprovided with 'wire gauze,

through which the motive fluid is strained before reaching the workingparts of the tool. I have deemed it unnecessaryto show this gauze and todescribe the precise construction in f detail, since the same will befamiliar to thosel skilled in this art. From' theinlet port or passagevt leads the passage 8 into the cham.-

berj9 of the vhollow differential distribution- 4valve 10 vcontained'inthe valve-boxy 10X, it

being understood that when the parts are vin 'the' position seen in Fig.1 the compressed .air passes. through the passage 9 and ports llinto thepiston-chamber 12 and drives'the piston 2 downwardly from the positionseen inFig.' l against" the chisel or 'other cuttin `tool.. (Not shown.)

When the pistou 2 moves from the positionseen in Fig. 1, it will beunderstood, that the exhaust takes place through the'passage and port 13into the 'passage 14, (shown dotted in Fig. 1,) into the annular chamber15, and out the port 16 in the cylinder-cap and the port 17 in thesleeve 18 of the handle 19 to the atmosphere, it being also understoodthat at the proper intervals live-air pressure enters the passage 2O andiiows through the passage 21 upon the larger or differential area 22 ofthe valve 10.

ICO

The pneumatic tool to which my invention is particularly adapted andwhich I have shown herein is the Well-known type of tool called theKeller tool, and the detailed operation of the valve and its piston willbe understood from patent to Julius Keller, No. 647,415, granted April10, 1900, a portion'of the tool therein being shown herein in Fig. 1;but I have deemed it unnecessary to show and described in detail theentire Keller tool, since it will be understood that the salientfeatures of my present invention may be employed with other pneu matictools with equal efficiency, and I have shown my invention applied tothat form of tool which I consider most efficient in practice.

23 designates the automatic throttle-valve employed, the same consistingof the head 24, having the large differential area 25, and a smallerhead 26, having a small differential area 32, said areas 25 and 32 beingjuxtaposed to each other, said heads being connected by the neck 27.

28 designates a Washer, of leather or other resilient or cushioningmaterial, which is interposed between the cylinder-cap 3 and thecontiguous Wall 29 of the handle 19.

30 designates a slot in the sleeve or extension 18 of the handle 19, theupper and lower extremities of which are adapted to contact with thehead 31 of the coupling or strainer 7, whereby the movement of thehandle 19 with respect to the cylinder-cap is limited, as

will be evident.

The operation is as follows: The parts normally appear as seen in Fig.4. Assuming liveair pressure to be entering the pressure-supply passageor port 6, it will be apparent that the vflow of the same will be asalready described When the parts are in the position seen `in Fig. l,which position they assume when the operator grasps the handle 19 andpresses the tool against the work, the valve 23 assuming the positionseen in Fig. 1, with its neck extending across the passage 6, and theexhaust-ports 16 and 17 being in alinement. The parts being in thisposition, the operation of the tool, or, in other words, thereciprocation of the piston, will occur without attention upon the partof the operator. As soon as the pressure is removed from the handle 19or the tool is removed from its Work it will be apparent that thelive-air pressure upon the large area 25 and upon the lower end of thepiston 28 will cause the diiferential throttle-valve 23 to move in thedirection indicated by the arrow a, whereupon the parts will appear inthe position seen in Fig. 4, and the head 26 being now in the positionseen will prevent the flow of compressed air tothe port 8, and thereciprocation of the piston will cease. At the same time theexhaust-port 17 will pass out of alinement With the port 16, as willalso be seen in Fig. 4. The contact of the Walls of the slot 30 with theportion 31 of the strainer 7 will act as a stop for the handle and willprevent improper movement of the throttlevalve 23, handle 19, and theiradjuncts.

It will be apparent that changes may be made in the manner ofconstructing and assembling the various parts as regards the form,operation, size, and minor details thereof Without departing from thespirit of my invention, and I therefore reserve to myself the right tomake all such changes and do not desire to be limited in every instanceto the exact construction I have herein shown and described.

yHaving thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. In a device of the character described, a cylinder head, athrottlevalve mounted therein and having dierential pressure areasjuxtaposed to each other, a handle movably supported upon said head andmeans for `of said handle and means for permitting pressure upon saidhandle to open said valve.

3. In a device of the character described, a cylinder-head, having apressure-supply duct extending therethrough, a throttle-valve consistingof a plurality of heads, having diiferential pressure areas joined by aneck, said neck being in alinement with said pressuresupply duct, whenlive air is being admitted to the working parts of the tool, andexhaustports in an extension of said handle and in said head, said portsbeing adapted to aline with each other when the throttle-valve is openand said ports being out of alinement when the throttle valve isautomatically closed.

4. The combination of a tool-cylinder, a cylinder-head therefor, avalve-box, a distribution-valve contained in said box, means forsecuring said head to said cylinder, a throttle-valve in said head,moving in alinement with saiddistribution-valve, said throttle-valveconsisting of a plurality of heads joined by a neck, the opposingsurfaces of said heads having differential areas, a handle having anextension movably mounted upon said head, means for limiting themovement of said extension, and a Washer located between said head andhandle.

5. The combination of a grasping-handle having a slot therein, acylinder-cap upon which said handle is movably supported, apressure-supply duct in said cap, a device communicating with saidpressure -supply duct and adapted to enter said slot and limit IOO IIO

the movement of said handle, a washer located between said handle andcap, and a diiierential throttle valve, located in said pressure-supplyduct, said throttle-valve consisting of heads of different diametersjoined by a neck, whereby live-air pressure acting upon the largediderential area'closes said pressure-supply duct and the pressure ofthe handle upon the larger of said heads When the tool is applied to thehead, opens said supply-duct.

6. In a device of the character specified, a cylinder-head, a'grasping-handle' longitudinally movable thereon andl separate meansoperated by the movement of said handle forerated by duid pressure forclosing said valve.

8. In a device of the character specified, a cylinder-head, an inletair-passage in said head, a throttle-valvehaving heads of dierentdiameters and a reduced neck therebetween, and a grasping-handle movableon said cylinder-head and operative to shift said valve so that its neckportion is interposed in said inlet-passage, said piston-heads beingoperative by means of the air entering said inlet-passage to actuate oneof said heads to cut o the flow of air therethrough. Y

9. In a device of the character specified, a cylinder-head, athrottle-valve movable there= in, and a handle manually movable on saidhead and operative to open said valve, said valve having an enlargeddifferential pres sure area, whereby it closes and retracts said handlewhen manual pressure is removedv therefrom. I

HERMAN G. KOTTEN. Witnesses:

H. C. BROWNE,

W. J. ToMLINsoN.

